Question about John Deere 420,1020,2010,2020,2510,2520 Tractor Float
There are four reasons for fouled spark plugs, 1, You have a resticted air flow ( dirty air filter, or partially engaged choke), so the mixture is rich all the time fouling tghe plugs. 2, You have a poor quality fuel ( old, stale ), and it wont combust/burn hot enough, then fouling the plugs. 3, You might have a piston ring failure causing engine oil to be left on the cylinder wall instead of being wiped back down, and then burning as part of the combustion process. Thus burning and causingg a rich condition again, and fouling the plugs. Then finally number 4, low engine compression. This is again caused by worn cylinder walls and worn piston rings, causing compressed air/fuel mixture to leak past the rings into the crankcase, and when the fuel/air mixture is compressed then ignited, some of the air needed to ignite the fuel has escaped, and thus a rich condition again, fouling the plugs.
Determining which of the Four are causing you fouling is your next step.
Hope this helps
Posted on Nov 13, 2010
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Posted on Jan 02, 2017
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